Administrator's Guide

Look-ahead routing
Issue 5 October 2002 1751555-233-506
LAR activation
LAR is active when a call is rejected with a cause value in the range of #34–#47
and #3 (no route to destination). The range of #34–#47 indicates congestion and
that resources are unavailable. The following cause values activate LAR:
NOTE:
When country code 13, protocol version a, is administered on the DS1
Circuit Pack screen, only the cause values #10 and #89 activate LAR.
LAR terminates when:
■ call is successfully routed
■ call is rejected with a non-LAR-triggering cause value
■ no further route preference can be used to route the call
LAR measurement
You can measure the number of attempted and successful LAR reroutes. The
Measurements LAR Route Pattern screen displays LAR measurements for a
particular route pattern. See Avaya MultiVantage™ System Monitoring and
Reporting for more information.
Cause Value Cause Description
3 no route to destination
34 no circuit/channel available
38 network out of order
41 temporary failure
42 switching equipment congestion
43 access information discarded
44 requested circuit or channel not available
47 resources unavailable